Shiela is 0.61 meters taller than her son.
y = -x + 1/3
+ x + x
--------------------------
x + y = 1/3
The decrease was 27%.
Step-by-step explanation:
Old value = $980
New value = $720
Decrease = Old value - New value

Percent decrease = 

Rounding off to near whole percent
Percent decrease = 27%
The decrease was 27%.
Keywords: Percentage, subtraction
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